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3x + 4y= 11 /×(-4)
12x + 9y = 30
-12x - 16y = -44
-7y = -14 / :(-7)
y=2
4x + 3y=10 /×4
3x + 4y= 11 / ×(-3)
16x + 12y = 40
-9x - 12y = -33
7x=7 /:7
x=1
Odp. y=2, x=1